Probability that two integers selected at random are prime to each other.

What is the chance that two integers selected at random are prime to each other ? Please help me in solving it

Re: Probability that two integers selected at random are prime to each other.

It is not clear what probability measure to use on subsets of natural numbers.

Re: Probability that two integers selected at random are prime to each other.

Simple example: 5,10,15

5,10

5,15

10,15 ***

Probability is 1/3; is that what you mean?